Thursday's shaking was not seismic-related, according to Stefanie Baxter, a geologist at the Delaware Geological Survey on the campus of the University of Delaware.

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That shaking sensation folks in coastal Sussex County and nearby Ocean City, Md., felt just before noon Thursday wasn't an earthquake, experts say, and was more likely the result of a sonic boom caused by aircraft.

Scientists at the Lamont Doherty Earth Observatory and Cooperative Seismography Network, who make the call, looked at the records from three regional seismographs - one at Lewes, one on the Eastern Shore and another at Reisterstown in Maryland and found the data was not consistent with an earthquake.

That said, the Reisterstown station did show a blip about the time of the ...